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(395) TRE-Toxicity-Reduction-Evaluation -Approaches for continuous effect monitoring of in situ groundwater remediation techniques. Kuester, Eberhard1, Dorusch, Falk1, Weiss, Holger1, Altenburger, Rolf1, 1 ABSTRACT- Aim of the project is the continuous TRE of different in situ groundwater remediation techniques with on-line biomonitors. An area near the City of Bitterfeld (South of Berlin, Germany) was a location of chemical industries for over 100 years- resulting in heavily contaminated groundwater. Major contaminants are various volatile organic chemicals. Because of the size of the contaminated groundwater body (approx. 200 million m3), eight different in situ remediation techniques (either physical, chemical, biological or a mixture of the three) are currently tested in semi-technical scale on a test site in Bitterfeld (SAFIRA project- funded by the German ministry of education and research). Because of the complexicity of the chemical contamination, chemical analysis of the groundwater alone is no sufficient tool for monitoring the effectiveness of the remediation techniques. Only predominant contaminants and some of the metabolites are analysed. No conclusions about synergistic or antagonistic toxic effects of the chemicals can be drawn from these data. Therefore two biomonitors are currently established on the test site in Bitterfeld (Vibrio fischeri luminescence inhibition, green algae fluorescence) measuring the overall toxicities of the original and the remediated groundwater in a continuously manner. Preliminary studies showed both correlation and non-correlation of measured toxicities with chemical analysis. Results will be discussed with respect to feasebility, adaptability and practicability of standardized biomonitors in TRE of groundwater remediation. In addition, validation of the two biomonitors will be discussed regarding the usefulness of the monitoring results for ecotoxicological assessment. Key words: TRE, groundwater remediation, biomonitors |
